Crystallization of Al-based metallic glasses. Structural aspects

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Abstract
Crystallization reactions, crystal morphologies and phase evolutions have been studied in melt-spun binary Al-Y and ternary AI-Fe-Y metallic glasses using X-ray diffraction, differential scanning calorimetry, electron microscopy and Mössbauer spectroscopy. The binary samples crystallize by a one-stage or two-stage primary reaction to form the α-Al phase, followed by polymorphous reactions to form different metastable compounds. The ternary glasses devitrify by either polymorphous or eutectic reactions. The ternary crystalline compounds are characteristically a metastable Al9(Fe, Y)2 phase with strongly textured columnar morphology, and a tetragonal Al70Fe16Y14 phase. The structure of the early-stage crystallization products depends on the nature of the short-range chemical order structures existing at different temperatures in the melts, which are partly retained in the glass phases.

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